scoreboard objectives add GameTimer dummy ["游戏时间总控"]
scoreboard objectives add GameTimer_tick dummy ["游戏时间-tick"]
scoreboard objectives add GameTimer_ss dummy ["游戏时间-秒"]
scoreboard objectives add GameTimer_mm dummy ["游戏时间-分"]

scoreboard players set #SYSTEM GameTimer_tick 20
scoreboard players set #SYSTEM GameTimer_ss 59
scoreboard players set #SYSTEM GameTimer_mm 5